diff --git a/IPython/html/static/notebook/less/widgets.less b/IPython/html/static/notebook/less/widgets.less
index 497fc42..4258fed 100644
--- a/IPython/html/static/notebook/less/widgets.less
+++ b/IPython/html/static/notebook/less/widgets.less
@@ -98,6 +98,7 @@
 
         .widget-combo-btn {
             min-width: 138px; /* + 26px drop arrow btn = 164px */
+            min-height: 1ex;
         }
 
         .widget-container {